The Robert Crown Law Library at Stanford hosts a digital project with a wealth of original sources related to all aspects of the policy (and its predecessor policies). Don't Ask Don't Tell Don't Pursue has

For dozens of works on the topic -- including books, DVDs, government reports, and websites, see this list. Almost everything in the list is available on campus, either in the Gallagher Law Library or in other libraries; a couple of works are available through Summit.